[TheBirthdayParty]

My vote, in your situation, is for the lamias simply because they transform and thus will last longer on the battlefiend than mandragoras and vine ogres are slow to get a group together, plus not all that effective once you do. 1 vine ogre vs 5 lamias vs...8 mandragoras? each summons, i'd choose the lamias. But you still need a few turns to get lamias or mandragoras out in a large enough unit/regiment.